今宵|こよいkoyoi[0]heiban (flat)

1. noun, adverbthis evening; tonight
   今宵こよい、奈落ならくの王おうが復活ふっかつする。↗

   Tonight, the King of Hell returns.

• Synonym今晩こんばんNeutralThe everyday word for tonight, and the most common of the three; greetings like 「こんばんは」 use it. 「今宵」 is an elegant, poetic alternative.
• Synonym今夜こんやNeutralAlso means tonight but leans slightly written, common in news and song lyrics; 「今宵」 sounds more archaic and refined.
• Antonym昨夜ゆうべNeutralMeans last night, the direct opposite of 「今宵」's tonight.

Say 「今晩」 or 「今夜」 in everyday speech; save 「今宵」 for poetry, toasts and other elegant contexts, as in 「今宵は満月」. For last night, use 「ゆうべ」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 今日きょうの夜よる。今日きょうの宵よい。
2. 夜明よあけすぐの時とき、前夜ぜんやを言ゆう。